Understanding the basics of electricity will help you understand networking signals and devices.

How might a multimeter be useful when installing and troubleshooting computer networks?

A multimeter would be useful for testing electrical outlets, testing for short circuits, testing voltage levels inside and outside networking devices, and simple cable testing.

attenuation

bits lose amplitude as they travel, giving energy to the medium

noise

the bit can acquire unwanted energy from external sources

How does a hub or a repeater affect the size of a collision domain?
A. it reduces it.
B. It enlarges it.
C. It eliminates it.
D. It has no effect on it.

B. It enlarges it.

Sketch and describe six things that can happen to 1 bit placed on a physical medium.

1. propogation - bits take time to travel along the medium
2. attenuation - bits lose amplitude as they travel, giving energy to the medium
3. reflection - some of the energy of the bit can bounce back in a direction opposite the original signal, causing confusion on the medium
4. noise - the bit can acquire unwanted energy from external sources
5. dispersion - bits boraden in time as they travel (pulse width gets larger)
6. collision - 2 bits from two different computers trying to communicate are on the same media at the same time.

What connector does UTP use?

STP.
BNC.
RJ-45.
RJ-69.

RJ-45.

What is an advantage that coaxial cable has over STP or UTP?

It is capable of achieving 10-100 Mbps.
It is inexpensive.
It can run longer distances unboosted.
None of the above.

Which of the following will cause a collision on an ethernet network?
A. two nodes having the same MAC
B. two or more nodes transmitting at the same time
C. non-OSI compliant protocols running on the network
D. multiple routed protocols running on the same network

Electricity is comprised of electrons. There are two main uses of electricity in networks: for powering the netwrok devices and to represent the data to be transmitted (signal) with hopefully only small amounts of noise. When a voltage is present, electroncs can be caused to flow, causing a current.

Networking devices are full of different circuits which do different jobs.

Electrical devices must be properly connected to ground, and ground is the reference voltage level of 0 volts when studying signal.

Networking media are often made of conductors coated with insultators.

The brains of intelligent netwokring devices are made from semiconductors.

dispersion

bits boraden in time as they travel (pulse width gets larger)

What is the maximum cable length for STP (without a repeater, etc)?

A. 100 ft.
B. 100 m.
C. 150 ft.
D. 1000 m.

B. 100 m.

A more compact version of coaxial cable is known as ......

ThinNet.
BNC.
STP.
UTP.

ThinNet.

propogation

propogation - bits take time to travel along the medium

reflection

some of the energy of the bit can bounce back in a direction opposite the original signal, causing confusion on the medium

Describe three modern ways to encode data for long distance transmission.

How many pairs of wire make up a UTP cable?
2 pair.
4 pair.
6 pair.
8 pair.

4 pair.

Which of the following cables is used to connect a router to the serial port of a PC?
A. a console cable
B. a cross -connect cable
C. an inverted cable
D. a patch cable

A. a console cable

What is one advantage of using fibre optic cabling in networks?
A. It is inexpensive.
B. It is easy to install.
C. It is available with or without an outer shield.
D. It is not susceptible to electromagnetic interference.

D. It is not susceptible to electromagnetic interference.

collision

2 bits from two different computers trying to communicate are on the same media at the same time.

150 ohm STP is used primarily for what installation?

A. Ethernet.
B. Fast Ethernet.
C. Token Ring.
D. None of the above.

C. Token Ring.

What is the importance of the EIA/TIA standards?

Provide framework for the implementation of the OSI model.
Provide guidelines for NIC manufacturers to follow.
Provide minimum media requirement for multi-product & multi-vendor environments.
None of the above.

What physical topology has all its nodes connected directly to one link, and has no other connections between nodes?

Linear bus.
Star.
Ring.
None of the above.

Linear bus.

What physical topology has all the devices daisy-chained together?

Linear bus.
Star.
Ring.
None of the above.

Ring

What is the primary disadvantage of the star network topology?

Doesn't allow all other nodes to communicate with each other conveniently.
If the central node fails, the whole network becomes disconnected.
It is much slower than the other topologies.
None of the above.

If the central node fails, the whole network becomes disconnected.

In a complete or full-mesh topology -- every node is:

Linked directly to every other node.
Connected to two central nodes.
Linked indirectly to every other node.
None of the above.

Linked directly to every other node.

The cellular topology uses ________ as its medium?

Electromagnetic waves.
The cellular network.
Infrared signals.
The atmosphere or the vacuum of space.

The atmosphere or the vacuum of space.

A ______ Network topology is a single closed ring consisting of node and links with each node connected to only two adjacent nodes.

Ring.
Irregular.
Star.
Tree.

Ring

A ______ Network topology uses a trunk node from which it branches out to other nodes?

Star.
Ring.
Tree.
Irregular.

Tree

The phone system is said to be structured as:

A Star Network.
An Extended Star Network.
A Trunk Network.
A Tree Network.

An Extended Star Network

In a complete (______) Network topology, every node is directly linked to every other node?

Mesh.
Cellular.
Dual Ring.
Bus.

Mesh

A ______ Network topology is a LAN architecture in which transmissions from network stations propagate the length of the medium in both directions and are received by all other stations?

Star.
Linear Bus.
Tree.
Irregular.

Linear Bus

A ___________ Network topology acts like two independent rings where only one ring is in use at a time?

Dual Ring.
Extended Star.
Tree.
Irregular.

Dual Ring

What type of fiber-optic cabled is required by the TIA/EIA 568B standard for horizontal cabling?

How can you determine which category of UTP cable any cabling belongs to?

By looking at the the end connectors.
By reading the UL marking.
By measuring the cable diameter.
By the color of the cable sheathing.

By reading the UL marking.

Which of the following best describes an access method?

The method used by software to access network file servers.
The method used to verify users as authorized for access to the network.
The way users access the network.
The way network devices access the network medium.

Frames from two devices impact and are damaged when they meet on the physical media.
Two nodes transmit at the same time & one data packet has priority so it removes the lesser packet.
Two data transmissions cross paths on the network media and corrupt each other.
A data transmission is corrupted due to an energy spike over the network media.

Frames from two devices impact and are damaged when they meet on the physical media.

Which of the following best describes a backoff algorithm?

A process wherein the network holds up some data so that important data can get through.
The retransmission delay enforced when a collision occurs.
The signal that a device on the network sends out to tell other devices data is being sent.
A mathematical function performed by networking software that prioritizes data packets.

The retransmission delay enforced when a collision occurs.

The TIA/EIA 568A standard specifies only Category 3, Category 4 and Category 5 cables qualify for use in LANs:

True.
False.

True

The TIA/EIA 568A standard calls for running 3 cables to each outlet. One for voice and two for data.

Category 3 (CAT 3) is by far the most frequently recommended and implemented cabling installations today.

True.
False.

False

What is the purpose of the second ring in a dual ring network?

Duplex.
Signaling.
Redunancy.
None of the above.

Redundancy

Which of the following describes the area in which data frames originate and collide?
A. broadcast domain
B. collision domain
C. collision segment
D. network domain

B. collision domain

Which of the following is a characteristic of fiber-optic cable?
A. It uses an intense incandescent light.
B. Its core is made of highly reflective Kevlar.
C. It relies on total internal cancellation to guide light for long distances.
D. It is capable of higher data rates than other types of network media.

D. It is capable of higher data rates than other types of network media.

Why are the pairs of wires twisted together in UPT cable?
A. Twisting of the wires makes six pairs fit in the space of four pairs.
B. Twisting of the wires makes it less expensive.
C. Twisting of the wires makes it thinner.
D. Twisting the wires reduces noise problems.